Final answer:
Refrigerant recycling involves removing and storing the refrigerant, cleaning it of contaminants, and reprocessing it for reuse.
Step-by-step explanation:
Refrigerant recycling is defined as the process of removing the refrigerant from a system and storing it in an external container with the lowest emissions possible, as well as cleaning the refrigerant of dirt and contaminants such as oil, acids, foreign material, and non-condensibles. The recycled refrigerant can then be reprocessed into a new product that can be reused in another system. Therefore, the correct answer is D) all of the above.